Straight-way valve



(No Model.)

T. HOLLAND.

I STRAIGHT WAY VALVE. No. 300,973. Patented June 24,1884.

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(No Model.)

. T. HOLLAND.

STRAIGHT WAY VALVE. N0. 300,973. Patented June 24, 1884.

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Witnesses: Inventor.-

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UNITED STATES PATENT @FFICE.

TIMOTHY HOLLAND, OF TROY, NEW YORK.

STRAIGHT-WAY VALVE.

SPECIFICATION forming part of Letters Patent No. 300,973, dated June 24, 1884.

Application filed January 31, 1884. (No model.)

T0 at whom it may concern Be it known that I, TIMOTHY HOLLAND, of the city of Troy, county of Rensselaer, State of New York, have invented a new and useful Improvement in Straight- Way Valves, of which the following is a specification.

My invention relates to certain improvements in straight-way valves, and which improvements have for their object to better adapt such valves for the use designed, to simplify their construction, and to reduce the cost of making them.

Accompanying this specification and forming a part of it there are two plates of drawings containing five figures illustrating my invention, with the same designation of parts by letter-reference used in all of them. Of these illustrations, Figure 1 shows a vertical section of a valve containing my invention, said section being shown as taken centrally through and at right angles to the disk-faces of the gates and their closing-seats. Fig. 2 shows another section of the same valve, taken below the cap and at right angles to that shown in Fig. 1. This illustration shows also in elevation the backs of one of the gates in position within the valve. Fig. 3 shows a perspective of one of the gates as removed from the valve-case, and with whatis its back when in position within the case turned toward the sight. This figure shows also a view of the combined spreader and lifter, which is constructed to be threaded to the valve-stem,

adapted to spread the gates to their seats to close and to hook into them to raise them. Fig.

'4. illustrates a View of the other gate in a like position to the one shown in Fig. 3. Fig. 5 illustrates a side elevation of the valve with a part of the case removed to show the position of the parts as interiorly placed.

The several parts of the valve are designated by letter-reference, and their function is described as follows:

The letter 0 indicates the'valve-case, and S the stem; W, a hand-wheel by which the stem is operated, and G the usual gland or stuffingbox through which the stem is operated. The letter L designates a combined spreader and lifter, that is interiorly threaded to the stem ,as indicated at T. This spreader and litter at its lower end is made to have the lateral arms A A oppositely projected therefrom. These arms have fiat tops a a and downwardly and inwardly inclined surfaces a a below the flat tops, which give them a wedge form.

The letters D D indicate the gates, each having the closing disk-face g,- and H H, the seats against which the gates are forced to close. The letters B B indicate the backs of the gates which face each other when in position within the valve, and the letters I) b designate two vertical parallel rib-form proj ections arranged on the back of each gate with an intervening space, 1). These projections are made with a downwardly and inwardly tapering incline, I, that at its upper end has the abrupt termination z, and each of the gate-backs is made with an incline, 1 arranged between theprojections b b.

The letters E E indicate ears projected oppositely and inwardly from the edges of each of the gates, and P projections on each side of the valve-case interior, adapted to engage with the said ears as the gates in descending come opposite their closingseats. The letters 0 indicate the valve-ports.

"When the parts are in position for use within the case, as shown at Fig. 5, the gates are placed back to back, with the abrupt terminations of each of the two inclines I of each gateback hooked onto the opposite sides of one of the arms A A so that the latter are between the gates,and the points on an on the projections 1) b of each gate are in contact. The stem S being threaded tothe combined lifter and spreader and not to the case, as the stem is oppositely turned,the combined spreader and lifter is raised or forced to descend. When the combined spreader and lifter is moved downwardly by turning the wheel and stem, the gates are also actuated to descend, and um til their'ears E engage with the stops or projections P, and with the downward movement of the combined spreader and'lifter continued the wedge-form arms A A of the latter engage with the inclines l in the rib-form projections, and the end of the combined spreader and lifter between the arms engages with the incline I on each opposite side of the gate-backs, which series of wedging engagements between the gate-backs and the spreader and lifter forces the gates to their closing-seats. This wedging force, it will be seen, is exerted centrally as well as at each side of the center of the gate-backs.

I am well aware that a conical form of boss upon the stem has been used to force the gates of straight-way valves to their. seats, and also that wedge-form nuts which were threaded to the stem were used for the same purpose. As the gates in my improved valve do not rock on each other at their backs for adjustment, the wedging force is applied to. a large area of the gate-backs, which keeps them secured under high pressures, and at the same time simplifies their construction.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

In a straight-way Valve, the combination of the parallel rib-form projections b b on the o backs of the gates, the inclines I, made in the arms having flat tops and wedge-form sides,

the ears E on the gate-backs, and the stops P on the interior of the valve-case, with the said parts constructed and arranged to operate as shown and described.

Signed at the city of Troy, New York, this 21st day of January, 1884.-

TIMOTHY HOLLAND.

Witnesses:

P. O. RIOKETTS,

CHARLES S. BRINTNALL. 

